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Chapter 2: Hearing Aids and Hearing Assistive
Technologies
Chapter 2 Question Test Bank
Multiple Choice (Select the best, most complete answer.)
Which of the following could not cause a BTE hearing aid to cease functioning properly?
*a. Broken cord to external receiver
b. Bad battery
c. Earmold plugged with cerumen
d. Malfunctioning microphone
Which of the following assistive devices is especially suited for use by the deaf for telephone
communication?
a. Telephone amplifier
*b. TDD or Relay
c. Infrared transmitter/receiver system
d. Closed captioning device
Which of the following is/are true concerning hearing aids?
a. In-the-canal hearing aids generally are not appropriate for clients with profound
hearing loss.
b. CROS hearing aids are a good option for cases with bilateral conductive hearing loss.
c. The shell of an ITE hearing aid is custom made for each person to be fit.
*d. Two of the above
Which device designed to assist in telephone use by those with hearing loss is found inside a
hearing aid?
a. TDD
b. CROS
*c. Telecoil
d. Call waiting
Which set of frequencies is used in computing a hearing aid’s HF Average Full-On Gain and
OSPL-90 values?
a. 1000, 1500, and 2000 Hz
b. 500, 1000, and 2000 Hz
c. 1000, 1600, and 2000 Hz
*d. None of the above
Of the components of a hearing aid fitting discussed, which contributes most to the success of
the patient adapting to amplification?
a. The most advanced hearing aid technology available
*b. A motivated patient with realistic expectations
c. An experienced professional
d. A good quality hearing aid
A patient with realistic expectations regarding his/her hearing aids understands that:
a. With advances in technology, little or no maintenance is required in the upkeep of
today’s hearing aids.
b. Hearing aids need never be noticed by other people.
*c. Hearing aids may not help in every communication setting
d. Most insurance policies cover at least some of the cost of hearing aids.
The main difference between analog and digital hearing aids is:
a. digital hearing aids are smaller because fewer components are needed
*b. how the sound is processed
c. digital hearing aids are programmable, analog aids are not
d. digital hearing aids always result in greater patient satisfaction
The main components of all electronic hearing aids include:
a. microphone, amplifier, power supply, frequency rectifier
b. power supply, volume control, A/D converter, acoustic coupler
c. receiver, integrated circuit, acoustic coupler, microphone
*d. microphone, receiver, power supply, acoustic coupler
Which hearing aid component transduces acoustic energy to electrical energy?
*a. microphone
b. A/D converter
c. receiver
d. rectifier
Hearing aids may be turned on and off using all but which of the following methods?
a. MTO switch
b. detent in the volume control wheel
c. remote control
*d. disconnecting the receiver
Telecoils:
a. are included on all hearing aids except CICs
b. are only helpful when using telephones (as the name implies)
*c. work on the principle of electromagnetic induction
d. are only available with digital hearing aids
Two methods of limiting output are:
a. peak clipping, distortion reduction
b. compression amplification, transducer control
c. ethereal transduction, peak clipping
*d. peak clipping and compression amplification
The term “Dynamic Range” refers to:
a. the range of frequencies that an individual can hear
*b. the range of usable hearing, defined by the softest sounds an individual can hear and
the loudest sounds he/she can tolerate.
c. the range of sounds a hearing aid can process
d. a 5,400 acre ranch located outside of San Antonio, Texas
A rule of thumb when choosing the style of hearing aid for a patient is:
a. An increase in size results in an increase in cost
*b. An increase in size results in an increase in fitting range
c. A decrease in size results in a decrease in cost across all technologies
d. A decrease in size results in an increase in available options
All of the following are true regarding the OSPL of a hearing aid except:
a. should be set according to the patient’s LDL
b. it is the most critical setting for a successful fitting
*c. describes the On-going Sound Pressure Level of a hearing aid
d. it is the highest level of sound the hearing aid can produce
According to ANSI S 3.22 (2003), the basic test parameters for an electroacoustic check of a
hearing aid include all but which one of the following:
a. gain
*b. volume control taper
c. compression characteristics
d. maximum power output
When the input signal is 45 dB and the output from the hearing aid is 95 dB, the gain value is:
a. dependent on the compression ratio
*b. 50 dB
c. 2.1 dB
d. 95 dB
5. 140 dB
Gain is defined by the formula:
*a. output – input = gain
b. input – output = gain
c. input + output = gain
d. output / input = gain
Which of the following is not a purpose for earmolds?
a. couple hearing aid to ear
*b. dampen wind noise in the ear canal
c. prevent feedback
d. alter the frequency response of the sound reaching the ear canal
A CROS hearing aid:
*a. puts a microphone on the bad ear, the receiver on the good ear
b. puts a microphone on the good ear, the receiver on the bad ear
c. puts a microphone on the bad ear, a receiver on each ear
d. puts a microphone on either ear, does not need a receiver
The following are common types of earmolds:
a. integrated, tube type, skeleton
b. resonator, custom molded, tube type
*c. shell, skeleton, canal
d. diotic, tube type, custom molded
BAHA stands for:
a. Better Acoustic Hearing Aid
b. Bone Advanced Hearing Accessory
c. Bilaterally Available Hearing Amplification
*d. Bone Anchored Hearing Aid
An earmold can be used to do all but which one of the following:
*a. improve the signal to noise ratio
b. allow low frequency amplification to escape from the ear canal
c. reduce the occlusion effect
d. allow normal input of unamplified sound
The right hearing aid style for an individual can be determined by considering all but which of
the following:
a. cosmetic concerns
b. physical limitations
c. financial concerns
*d. whether a digital or analog hearing aid is needed
According to your text regarding Hearing Assistive Technology, all of the following are
examples of the different categories of Assistive Devices except:
a. Hardwire devices
b. Infrared systems
*c. Hearing Aids
d. Audio loop systems
e. Telephone Listening Devices
Binaural amplification for a person with a bilateral hearing loss is a more desirable option than a
monaural fit because:
a. Speech perception is optimized when in difficult listening settings.
b. Sound localization is enhanced.
c. Hearing is more natural and balanced.
*d. All of the above.
Which set of frequencies is used in computing a hearing aid’s HF Average Gain and OSPL-90
values?
*a. 1000, 1600, and 2500 Hz
c. 500, 1000, and 2000 Hz
c. 1000, 1800, and 2000 Hz
d. None of the above
The speaker component in a hearing aid is also referred to as a(n):
a. amplifier
*b. receiver
c. gain control
d. coupler
Gain is described by all but one of the following:
*a. The level of internal noise generated by the hearing aid
b. Describes how much the input signal is amplified
c. The difference between the output SPL and the input SPL
d. is different as the volume control on an amplifier is adjusted
Which auditory system has a transmitting system which will generally keep the signal from
being transmitted outside of the space where it is contained?
a. FM
b. ILA
*c. Infrared
d. FM/ILA
All of the following types of hearing aids have internal receivers:
a. Body aid, BTE, ITE
*b. BTE, ITE, CIC
c. Body aid, ITC
d. ITE, eyeglass aid, body aid
When the input signal is 30 dB and the output from the hearing aid is 75 dB, the gain value is:
*a. 45
b. 50
c. 60
d. 75
e. 140
Which of the following is not a purpose for earmolds?
a. couple hearing aid to ear
*b. prevent damage of hearing aid receiver
c. prevent feedback
d. alter frequency response of hearing aid
All amplification systems include three basic components:
a. microphone, speaker, receiver
b. microphone, receiver, output limiter
c. tone control, output limiter, volume control
*d. receiver, amplifier, microphone
Distortion:
*a. is present when the output signal is changed unfavorably from the original signal
b. is when sound is made louder than it was originally
c. is when sound is amplified
d. always improves the clarity of sound
The Count the Dot audiogram is used:
a. to estimate the 0SPL90
b. to estimate the aided SRT
*c. to estimate the percent of speech that is audible
d. to estimate the degree of hearing loss
Dynamic range refers to the area between:
*a. SRT and discomfort level
b. 125 Hz and 8000 Hz
c. no gain and full on gain
d. pure tone average and SRT
True / False
A hearing aid fitter can use real ear measures to see if the gain is adequate. (True)
Individuals with losses of 26-30 dB who also experience communicative difficulty will not
benefit from amplification because they are so close to normal limits. (False)
Most candidates for hearing aids are people with sensorineural hearing loss. (True)
Feedback happens because signals or acoustic energy from the output goes from the receiver to
the microphone over and over. (True)
The uncomfortable level for a person gives us a guide in setting the tone control on the hearing
aid. (False)
One purpose of the ear mold is to transmit sound from the receiver to the ear canal without
bothersome feedback. (True)
A cochlear implant costs between $4000 and $6000 (False)
Zinc air cell batteries generally are not affected by “shelf life” problems observed with other
types of batteries. (True)
BTE, eyeglass and ITE hearing aids all use tube type molds. (False)
0SPL 90 is the average sound pressure level when volume is 1/2 on and input is at 90 dB. (False)
Acclimatization makes it harder to fit hearing aids and know what they will do two months later.
(True)
Equivalent input noise is the prescribed way to measure environmental noise. (False)
It is very important that the earmold provide a very tight seal when used in a slight/mild hearing
loss case in order to prevent bothersome feedback. (False)
The microphone is an example of a transducer. (True)
Cases with conductive hearing loss should never be fit with a hearing aid. (False)
Internal noise is the relationship between acoustic signal and electrical background sounds
arising from the amplifying device. (True)
Frequency response characteristics of an amplification system are determined entirely by the
response of the microphone. (False)
Although digital amplification is becoming increasingly common, ITC and CIC hearing aids
cannot utilize digital circuitry at the present time due to size issues. (False)
CROS hearing aids are designed for use with persons having a profound loss in one ear and
normal hearing in the other ear. (True)
The new bone-anchored hearing aid was designed to be used with cases having bilateral
sensorineural hearing loss. (True)
If a BTE hearing aid squeals while in the person’s ear, the earmold may be too small or may not
fit well. (True)
Hardwire assistive listening devices utilize FM radio wave technology to provide improved
signal –to-noise listening ratios for users. (False)
Assistive Listening Devices can only be used by those with telecoils in their hearing aids. (False)
The purpose of directional microphones is to increase the signal to noise ratio for the wearer.
(True)
Real Ear Measurement is one method of determining whether or not hearing aids are properly
adjusted for the patient’s hearing loss. (True)
Behind-the-ear hearing aids can fit any degree of loss except slight to mild. (False)
In attempting to determine which hearing aid to fit on an individual, obtaining optimum acoustic
results is most important, and cost should not be considered. (False)
With an Inductive Loop system the amplified signal is fed to the user through an electromagnetic
field. (True)
One major advantage of group amplification systems is that they can improve signal to noise
ratio for multiple listeners. (True)
The frequency response of a hearing aid describes the amount of gain at each frequency. (True)
ALDs using FM technology are only available for group systems. (False)
The “C” in HIO-BASICS stands for “Compression” (False)
FM systems will often produce a better signal-to-noise ratio for the listener than conventional
hearing aids in a classroom setting. (True)
Short Answer /Essay
List two major ways in which using binaural hearing aids is significantly better when
compared with using a single hearing aid for a person with significant hearing loss in both ears.
Identify three different specialized devices which a hearing impaired person might find helpful in
using the telephone.
List the elements and briefly describe the HIO BASICS.
List and briefly describe the elements of the CLEAR handout.
List five hearing aid styles and briefly describe an advantage and disadvantage of each.
Explain why each of the following hearing aid characteristics is important to consider when
selecting the correct hearing aid for an individual (6 pts.).
a. gain
b. frequency response
c. maximum output
Briefly define/describe each of the following as they pertain to hearing aids or cochlear implants:
a.
b.
c.
d.
e.
f.
Telecoil
Venting
Electroacoustic analysis
Audibility Index (AI) (Count-the-dots)
CIC
Acclimatization